Question

Above what Fe2+concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 9.30?

The ?sp of Fe(OH)2 is 4.87×10⁻¹⁷.

[Fe2+]=_______M

Answer 1

Fe (OH)a dissociates as, te cohla - Feat+2014 Ksp = [Feat] [own]? - 4.87X1017 It is given that pH=9.30 from the relation, pH +POH = 24. polt - 14-pH = 14 -9,3=4.7. we know that pot = -log (OH) = 4.7 --- [OH-] = - antilog [pot) [04] - 1.995810-5 - 2 x 10**M ik sp - [Fe 2+] [ou]?> [Fe2+] - ta ksp/[oH+)? [feat] = 4.7810 [2x 10-572 = 1.175x107M